β-Mg-17Al12相对轧制态AZ80镁合金组织和性能的影响  

Effects of β-Mg_(17)Al_(12) Morphology on Microstructure and Mechanical Properties of As-rolled AZ80 Alloy

作　　者：张路[1] 房灿峰[1] 刘晓滕[1] 郝海[1] 张兴国[1] 

机构地区：[1]大连理工大学材料科学与工程学院辽宁省凝固控制与数字化制备技术重点实验室

出　　处：《特种铸造及有色合金》2017年第4期369-372,共4页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划资助项目(2016YFB0701204);国家自然科学基金资助项目(51374047);中央高校基本科研业务费专项资金资助项目[DUT15ZD201,DUT15JJ(G)01]

摘　　要：通过调整均匀化时长,在AZ80镁合金中获得了具有不同分布特征的β-Mg17Al12相。利用金相显微镜、扫描电镜等分析手段,研究了β相分布特征对AZ80镁合金轧制态组织和性能的影响。研究发现,β相尺寸、形貌以及分布与AZ80镁合金轧制组织中动态再结晶行为密切相关。晶界粗大的β相利于动态再结晶的发生,并形成细晶带;而β相主要以弥散细小的颗粒在晶内存在时,细晶带发育不完全,使得许多原始晶粒形成孪晶以协调变形。在420℃下保温12h的均匀化处理更利于提高AZ80镁合金板材的综合力学性能。β-Mg17Al12 phases with various distribution features in AZ80 alloy were observed by homogenizing treatment at 420 ℃ for different time.The effects ofβphase on microstructure and mechanical properties of as-rolled AZ80 alloy were investigated by metallography microscopy,scanning electron microscopy（SEM）and tensile tests.The results show that the size,morphology and distribution ofβphase are closely related with the dynamic recrystallization behavior during hot rolling process.Coarseβphase distributed along the grain boundaries can promote dynamic recrystallization and enhance the formation of fine grain band.However,when most ofβphases are tiny and distributed just in grain interiors dispersedly,fine grain bands become uncompleted and twinning happens in some initial grain interiors.The desirable comprehensive mechanical properties of as-rolled AZ80 alloy can be presented by homogenizing at 420 ℃for 12 h.

关 键 词：β-Mg17Al12相 AZ80镁合金 轧制 动态再结晶 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料]